mirror of
https://github.com/sheumann/hush.git
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158 lines
3.4 KiB
C
158 lines
3.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini swapon/swapoff implementation for busybox
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//usage:#define swapon_trivial_usage
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//usage: "[-a]" IF_FEATURE_SWAPON_PRI(" [-p PRI]") " [DEVICE]"
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//usage:#define swapon_full_usage "\n\n"
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//usage: "Start swapping on DEVICE\n"
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//usage: "\n -a Start swapping on all swap devices"
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//usage: IF_FEATURE_SWAPON_PRI(
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//usage: "\n -p PRI Set swap device priority"
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//usage: )
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//usage:
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//usage:#define swapoff_trivial_usage
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//usage: "[-a] [DEVICE]"
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//usage:#define swapoff_full_usage "\n\n"
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//usage: "Stop swapping on DEVICE\n"
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//usage: "\n -a Stop swapping on all swap devices"
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#include "libbb.h"
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#include <mntent.h>
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#ifndef __BIONIC__
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# include <sys/swap.h>
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#endif
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#if ENABLE_FEATURE_MOUNT_LABEL
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# include "volume_id.h"
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#else
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# define resolve_mount_spec(fsname) ((void)0)
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#endif
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#ifndef MNTTYPE_SWAP
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# define MNTTYPE_SWAP "swap"
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#endif
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#if ENABLE_FEATURE_SWAPON_PRI
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struct globals {
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int flags;
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define g_flags (G.flags)
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#else
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#define g_flags 0
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#endif
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#define INIT_G() do { } while (0)
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static int swap_enable_disable(char *device)
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{
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int status;
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struct stat st;
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resolve_mount_spec(&device);
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xstat(device, &st);
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#if ENABLE_DESKTOP
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/* test for holes */
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if (S_ISREG(st.st_mode))
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if (st.st_blocks * (off_t)512 < st.st_size)
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bb_error_msg("warning: swap file has holes");
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#endif
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if (applet_name[5] == 'n')
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status = swapon(device, g_flags);
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else
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status = swapoff(device);
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if (status != 0) {
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bb_simple_perror_msg(device);
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return 1;
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}
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return 0;
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}
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static int do_em_all(void)
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{
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struct mntent *m;
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FILE *f;
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int err;
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f = setmntent("/etc/fstab", "r");
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if (f == NULL)
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bb_perror_msg_and_die("/etc/fstab");
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err = 0;
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while ((m = getmntent(f)) != NULL) {
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if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0) {
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/* swapon -a should ignore entries with noauto,
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* but swapoff -a should process them */
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if (applet_name[5] != 'n'
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|| hasmntopt(m, MNTOPT_NOAUTO) == NULL
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) {
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#if ENABLE_FEATURE_SWAPON_PRI
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char *p;
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g_flags = 0; /* each swap space might have different flags */
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p = hasmntopt(m, "pri");
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if (p) {
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/* Max allowed 32767 (==SWAP_FLAG_PRIO_MASK) */
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unsigned int swap_prio = MIN(bb_strtou(p + 4 , NULL, 10), SWAP_FLAG_PRIO_MASK);
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/* We want to allow "NNNN,foo", thus errno == EINVAL is allowed too */
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if (errno != ERANGE) {
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g_flags = SWAP_FLAG_PREFER |
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(swap_prio << SWAP_FLAG_PRIO_SHIFT);
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}
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}
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#endif
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err += swap_enable_disable(m->mnt_fsname);
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}
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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endmntent(f);
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return err;
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}
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int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
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{
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int ret;
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INIT_G();
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#if !ENABLE_FEATURE_SWAPON_PRI
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ret = getopt32(argv, "a");
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#else
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if (applet_name[5] == 'n')
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opt_complementary = "p+";
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ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags);
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if (ret & 2) { // -p
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g_flags = SWAP_FLAG_PREFER |
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((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT);
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ret &= 1;
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}
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#endif
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if (ret /* & 1: not needed */) // -a
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return do_em_all();
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argv += optind;
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if (!*argv)
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bb_show_usage();
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/* ret = 0; redundant */
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do {
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ret += swap_enable_disable(*argv);
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} while (*++argv);
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return ret;
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}
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